The Boston Globe reports that concerns about the soaring costs of prescription drugs have focused on new specialty treatments that can cost tens, even hundreds of thousands of dollars per patient. But insurers, health care providers, and industry specialists are now raising alarms about a new potential source of rising prices: generic drugs. Insurers say they are seeing huge cost increases for some commonly used generic drugs, with prices surging 15, 25, and even 75 times what they were just two years ago.